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-@Section
-   @Title { Introduction }
-   @Tag { pie_intr }
-@Begin
-@PP
-The Lout definitions for pie graph formatting are kept in a file called
-{@Code "pie"}, which you must include at the start of your document if
-pie.file @Index { @Code "pie" setup file }
-you want pie graphs, like this:
-@ID -1px @Break @OneRow @Code {
-"@SysInclude { pie }"
-"@SysInclude { doc }"
-"@Doc @Text @Begin"
-"..."
-"@End @Text"
-}
-Setup files for specialized packages, such as {@Code "pie"}, should be
-included before the main setup file.  Once this is done, the @Code "@Pie"
-symbol used below will then be available for use anywhere within your
-document.  As usual in Lout, the @Code "@Pie" symbol produces an object
-which may appear anywhere at all -- in a centred display, for example,
-or in a figure, or as an entry in a table.
-@PP
-A pie graph is made by a @Code "@Pie" symbol enclosing a sequence of
-@Code "@Slice" symbols.  These @Code "@Slice" symbols and their options
-are the only things that may appear inside the @Code "@Pie" symbol.
-@PP
-Every option of @Code "@Slice" is also an option of {@Code "@Pie"}.
-Giving a value to such an option at @Code "@Pie" will make that
-the default value for very {@Code "@Slice"}.  For example,
-you can write
-@ID -1px @Break @OneRow @Code @Verbatim {
-@Pie
-    weight { 20 }
-{
-    ...
-}
-}
-to give every slice a weight (angular extent) of 20.  If all but a
-few slices have the same weight, you can still do this, just giving
-a @Code weight option to the exceptional slices.
-@PP
-Furthermore, every option of @Code "@Pie" appears in the setup
-file, and giving a value to an option there makes that value the
-default value for every @Code "@Pie" in your document.  For example,
-if you want every slice of every pie to be light red, you can set
-the @Code paint option in the setup file to {@Code lightred},
-and all your slices will be painted this colour unless you
-override the setup file value by giving @Code paint options to
-some pies or slices.
-@PP
-See Section @NumberOf setup to find out how to make your own copy
-of the setup file, perhaps calling it {@Code mypie}, and change
-some options within it.  Your document would then typically
-start like this:
-@ID -1px @Break @OneRow @Code {
-"@Include { mypie }"
-"@SysInclude { doc }"
-"@Doc @Text @Begin"
-"..."
-"@End @Text"
-}
-and by changing options within file @Code "mypie" you can
-affect every pie graph in your document.
-@End @Section